JPS62147053A - Booster pump device - Google Patents

Abstract

PURPOSE:To simplify the external mechanism of a high pressure pump device and make the pump compact by providing a piston stroke detecting means and a liquid delivery passage within pump body. CONSTITUTION:An expanded chamber 2 is formed in a booster pump body 1 to constitute a hydraulic cylinder for actuating a reciprocating piston 4. Both ends of the reciprocating piston 4 are inserted in a pump cylinder 3 respectively for forming two pump chambers. A liquid suction passage 14 and a liquid delivery passage 15 having non-return valves 12 and 13 continuous to said pump chambers are provided in the pump body 1. And both ends of the expanded chamber 2 are fitted with proximity switches 16 and 16 for detecting the stroke of the reciprocating piston 4 and an electromagnetic changeover valve 8 for controlling hydraulic pressure to a hydraulic cylinder is actuated by the proximity switches 16 and 16.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The invention relates to a plunger pump device for pressure increase.

``Prior Art'' Conventionally, in a pressure booster pump based on the reciprocating action of a piston, it has been necessary to detect the stroke of the piston or plunger outside the pump body. In addition, the high-pressure liquid discharge passages at both ends of the cylinder were communicated outside the pump body by high-pressure pipes, which complicated the external mechanism of the pump body, and caused accidents due to damage to the high-pressure pipes, resulting in quality defects.

"Problems to be Solved by the Invention" The present invention directly detects the reciprocating end of the piston inside the pump body, and connects the high-pressure liquid discharge path at both ends inside the pump body, thereby simplifying the external mechanism and preventing failures. The purpose of this is to obtain a small pressure booster pump.

"Means for Solving the Problems" The present invention provides a cylinder in the main body with an enlarged diameter chamber formed in the center, a reciprocating piston is fitted in the cylinder, and the piston has an end area in the center. A pair of oil supply ports for reciprocating piston operation are provided in the enlarged diameter chamber, and a oil supply pump is connected to the oil supply ports via an electromagnetic switching valve. A plan in which a liquid suction port and a liquid discharge port are opened at both ends, and a liquid suction path is connected to the liquid suction port via a check valve, and a liquid discharge path is connected to the liquid discharge port via a check valve. In the jar pump, a proximity switch for the enlarged diameter section is embedded in the end of the enlarged diameter chamber, and a signal from the switch operates the switching device of the switching valve, and the liquid discharge passages at both ends of the cylinder are connected to the main body. It is composed of a pressure boosting pump device connected by a communication path provided in the two.

Therefore, when the liquid suction channels at both ends of the main body are connected to the liquid tank and the oil supply pump is operated, oil is supplied into the enlarged diameter chamber from one oil supply port via the electromagnetic switching valve and presses the pressure receiving surface of the enlarged diameter part of the piston. Then, the piston is slid to the right in Fig. 1. Therefore, the suction liquid in the cylinder on the right side of the piston is pushed to the right, and the check valve on the liquid suction port side is closed. Since the check valve is opened, liquid is discharged from the liquid discharge path at a pressure higher than the oil supply pressure of one of the oil supply ports, and liquid is also simultaneously discharged from the liquid discharge path on the left side of Fig. 1 from the communication passage.The above-mentioned piston As the cylinder slides to the right, the check valve in the left liquid suction path opens and the check valve in the left liquid discharge path closes, so the left side of the cylinder is filled with liquid from the liquid tank.This state The proximity switch detects the enlarged diameter portion, and the signal activates the switching device of the electromagnetic switching valve, which slides the switching valve to the left in Figure 1 to switch the oil supply path. Since the engine stops and oil supply starts from the other oil filler port, the pressure receiving surface of the enlarged diameter part is pushed and the first
Slide the piston to the left in the figure. Therefore, due to the action of the check valve on the left side, the liquid filling the left side of the cylinder becomes a high-pressure liquid and is discharged into the liquid discharge passage without flowing back into the liquid suction passage, and is also discharged from the right liquid discharge passage via the communication passage. High-pressure liquid is discharged simultaneously from both the left and right liquid discharge passages without interruption. The proximity switch is closed by the leftward sliding of the enlarged diameter portion, and the switching device operates in response to the signal thereof, returning the switching valve to the left to the state shown in FIG. 1 and repeating the same operation as described above.

"Example" A blind cylinder 3 is formed inside a pump body 1, and an enlarged diameter chamber 2 is formed in the center thereof. The enlarged diameter area of the enlarged diameter chamber 2 is formed larger than the area of both ends of the cylinder 3. By fitting the reciprocating piston 4 inside the cylinder 3 and having the enlarged diameter part 5 in the center thereof, the pressure receiving area of the enlarged diameter part 5 is made larger than the area of both ends of the piston 4. A pair of oil supply ports 6.7 for reciprocating piston operation are opened in the enlarged diameter chamber 2, and a fuel pump 9 is connected to the oil supply ports 6.7 via an electromagnetic switching valve 8 via piping 19.19. A liquid suction port 10 and a liquid discharge port 11 are opened at both left and right ends of the cylinder 4, respectively, and a liquid suction passage 14 is connected to the liquid suction port 10 via a check valve 12.
Furthermore, it is connected to a liquid tank 21 by a piping 20. A liquid discharge passage 15 is connected to the liquid discharge port 11 via a check valve 13, and a pipe 22 is connected to the liquid discharge passage 15, and both left and right liquid discharge passages 15.15 are connected to the main body. The connection is made through a communication path 18 formed in the 1. Further, a proximity switch 16 for detecting the enlarged diameter portion is embedded in the end of the enlarged diameter chamber 2. A reed switch or the like is used as the proximity switch 16, which closes when the enlarged diameter portion 5, which is a magnetic material, approaches and opens when it moves away, but other proximity switches may also be used. The switching bag fH17 of the switching valve 8 shown in Fig. 1 and the spring 23
The switching valve 8 is activated by energizing the relay by a signal generated by closing the right-hand proximity switch 16 in FIG. 1 and closing the self-holding type A contact for the solenoid. Slide to the left in Figure 1 to switch the oil supply path. Further, the signal generated by closing the left proximity switch 16 energizes another relay, and by opening the self-holding contact for the solenoid, the solenoid is demagnetized and the switching valve 8 is returned to the position shown in FIG. 1 by the force of the spring 23. be able to.

In addition, a non-magnetic ceramic screw plug for closing the buried hole of the Monoke proximity switch 16 indicated by 24 in the figure, and a 25-piece oil supply pump 9 are provided.
26 is the oil supply tank, 27 is the spring of the check valve 12, 13, 28 is the signal line, and 29 is the leakage liquid discharge hole. The oil pressure supplied by the oil supply pump 9 is approximately 140 Kq/crtJ, and the liquid discharge pressure from the liquid discharging path 15 is approximately 50 QKq/cnf. A floating liquid is produced by suction, or the left and right liquid suction passages 1
4.14 can also be used to aspirate and mix different types of liquids.

"Effects" Since the present invention is configured as described above, the external mechanism of the pressure boosting pump device having high pressure liquid discharge channels at both ends of the cylinder can be simplified and made smaller, and it is also possible to create a safe pressure boosting plan with fewer failures. A jar pump is what you get.

[Brief explanation of drawings]

FIG. 1 is a longitudinal palindrome showing an embodiment of the pressure boosting pump device of the present invention, FIG. 2 is a diagram showing a leftward sliding state of the piston, and FIG. 3 is a rightward sliding state diagram. 1. Main body, 2. Expansion chamber, 3. Cylinder, 4.
Reciprocating piston, 5... Expanded diameter part, 6.7... Oil filler port, 8
・・Solenoid switching valve, 9・・Oil supply pump, 10・・Liquid suction port 1
11...Liquid discharge port, 12.13...Check valve, 14...Liquid suction path, 15...Liquid discharge path, 16...Proximity switch, 17...
Switching device, 18... communication path.

Claims (1)

[Claims] 1) A cylinder with an enlarged diameter chamber formed in the center is provided in the main body, a reciprocating piston is fitted into the cylinder, and an enlarged diameter part with a larger pressure receiving area than the end area of the piston is provided in the center of the piston. A pair of oil supply ports for reciprocating piston operation are opened in the enlarged diameter chamber, a oil supply pump is connected to the oil supply ports via an electromagnetic switching valve, and a liquid suction port and a liquid discharge port are provided at both ends of the cylinder, respectively. In a plunger pump that is open and has a liquid suction path connected to the liquid suction port through a check valve, and a liquid discharge path connected to the liquid discharge port through a check valve, the end portion of the enlarged diameter chamber The above-mentioned proximity switch for the enlarged diameter portion is buried in the main body, and the switching device of the above-mentioned switching valve is operated by a signal from the switch, and the liquid discharge passages at both ends of the cylinder are connected by a communication passage provided in the main body. Pressure boosting pump device.